The UFC boss believes the size difference between the two fighters leaves McGregor facing an impossible task as he looks to become a dual champion.

“I don't see how he wins this fight,” said White. “McGregor’s the 145-pound champion, he can stay in his own lane, but this guy’s moving up to 155 to take on an animal who destroyed Cowboy Cerrone, destroyed Anthony Pettis.

“This isn't like boxing, where you move up two or three pounds, you move up 15 pounds.”

The featherweight champion, who defeated Jose Aldo in just 13 seconds at UFC 194 to claim the title, normally weighs around 170 pounds, so the drop to 155 won't be as grueling for the Irishman.

McGregor's recent comments on Twitter also suggest he’s not concerned about fighting at a different weight.

While McGregor and Dos Anjos prepare to do battle, UFC new-boy CM Punk’s first opponent could well be Mickey Gall after his quick submission win against Mike Jackson at Saturday’s UFC Fight Night 82 in Las Vegas.

Gall has targeted a fight with Punk, possibly at UFC 200 in July, after entering the promotion following an appearance on the ‘Looking for a Fight’ reality show.

Gall said after his win against Jackson: “Last time I was on the mic, I was talking about one guy - CM Punk.